The country also has 402 kilometers (249 miles) of coastline on the Bight of Biafra, part of the Atlantic Ocean. The topography of Cameroon is varied, ranging from tropical rain forests in the south to mountainous highlands in some western central regions, and semi-arid savanna in the far north.
The Ionisphere bounces radio waves back to earth and regulates the amount of radiation that gets to the lower atmospheres. It all depends on the Sun's activity. The stratosphere is what actually protects us from the UV rays of the sun.
When the waves strike the surface of the ocean, about 60 percent of the signal bounces off. The more wind that pushes across water, the rougher the surface of the sea gets. Bigger, more chaotic waves break up the GPS radio waves more as they reflect off the surface.